4 layers82.8 × 88.9 mm

Metal detector test
bobasaurus/lumber-plunder-metal-detector
A VLF induction balance metal detector with a wooden body
111 parts11GPL-3.0
KiCad boards from 3 GitHub repositories tagged “detector”, the most starred first; open any of them in PCBKit.

bobasaurus/lumber-plunder-metal-detector
A VLF induction balance metal detector with a wooden body

dikkedimi/RailcomDetector
based on https://www.rmweb.co.uk/community/index.php?/topic/123719-handmade-railcom/

flooklab/Lightning_Detector
An experimental open hardware project for early notification about approaching thunderstorm activity